Footstool



FIG. 1 is a top plan view of a footstool showing my new design;

FIG. 2 is a bottom plan view of my design;

FIG. 3 is a front elevational view of my design;

FIG. 4 is a back elevational view of my design; and,

FIG. 5 is a left side elevational view of my design, the right side being a mirror image. 

The ornamental design for a footstool, as shown and described. 